package com.example.demo1;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class BlurBitmapUtil {
	
    /**
     *@param glide 的模糊算法
     *@描述  快速模糊化处理bitmap
     *@作者  glide
     *@时间  2016/12/5 19:22
     */
    public static Bitmap fastblur(Bitmap sentBitmap, int radius) {
        Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
        if (radius < 1) {
            return (null);
        }
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        int[] pix = new int[w * h];
        bitmap.getPixels(pix, 0, w, 0, 0, w, h);

        int wm = w - 1;
        int hm = h - 1;
        int wh = w * h;
        int div = radius + radius + 1;

        int r[] = new int[wh];
        int g[] = new int[wh];
        int b[] = new int[wh];
        int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
        int vmin[] = new int[Math.max(w, h)];

        int divsum = (div + 1) >> 1;
        divsum *= divsum;
        int temp = 256 * divsum;
        int dv[] = new int[temp];
        for (i = 0; i < temp; i++) {
            dv[i] = (i / divsum);
        }

        yw = yi = 0;

        int[][] stack = new int[div][3];
        int stackpointer;
        int stackstart;
        int[] sir;
        int rbs;
        int r1 = radius + 1;
        int routsum, goutsum, boutsum;
        int rinsum, ginsum, binsum;

        for (y = 0; y < h; y++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            for (i = -radius; i <= radius; i++) {
                p = pix[yi + Math.min(wm, Math.max(i, 0))];
                sir = stack[i + radius];
                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                rbs = r1 - Math.abs(i);
                rsum += sir[0] * rbs;
                gsum += sir[1] * rbs;
                bsum += sir[2] * rbs;
                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }
            }
            stackpointer = radius;

            for (x = 0; x < w; x++) {

                r[yi] = dv[rsum];
                g[yi] = dv[gsum];
                b[yi] = dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (y == 0) {
                    vmin[x] = Math.min(x + radius + 1, wm);
                }
                p = pix[yw + vmin[x]];

                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[(stackpointer) % div];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi++;
            }
            yw += w;
        }
        for (x = 0; x < w; x++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            yp = -radius * w;
            for (i = -radius; i <= radius; i++) {
                yi = Math.max(0, yp) + x;

                sir = stack[i + radius];

                sir[0] = r[yi];
                sir[1] = g[yi];
                sir[2] = b[yi];

                rbs = r1 - Math.abs(i);

                rsum += r[yi] * rbs;
                gsum += g[yi] * rbs;
                bsum += b[yi] * rbs;

                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }

                if (i < hm) {
                    yp += w;
                }
            }
            yi = x;
            stackpointer = radius;
            for (y = 0; y < h; y++) {
                pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16)
                        | (dv[gsum] << 8) | dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (x == 0) {
                    vmin[y] = Math.min(y + r1, hm) * w;
                }
                p = x + vmin[y];

                sir[0] = r[p];
                sir[1] = g[p];
                sir[2] = b[p];

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[stackpointer];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi += w;
            }
        }

        bitmap.setPixels(pix, 0, w, 0, 0, w, h);
        return (bitmap);
    }
	
	
	/**
	 * 直接生产转换模糊的bitmap
	 * @param context
	 * @param ResourceId
	 * @return 
	 */
	public static Bitmap getGaoshiBitmap(Context context,int ResourceId){
		
		Bitmap  outputBitmap = BitmapFactory.decodeResource(context.getResources(), ResourceId);
		outputBitmap = BlurBitmapUtil.fastblur(outputBitmap, 25);
		return outputBitmap;
	}
	
	
//	/** 
//	 * 合并两张bitmap为一张  
//	 * 上下合并
//	 * @param topbitmap 
//	 * @param bottombitmap 
//	 * @return Bitmap 
//	 */  
//	public static Bitmap combineBitmap(Bitmap topbitmap, Bitmap bottombitmap) {  
//	    if (topbitmap == null) {  
//	        return null;  
//	    }  
//	    if(bottombitmap == null){
//	    	return null;
//	    }
//	    int topWidth = topbitmap.getWidth();  
//	    int topHeight = topbitmap.getHeight();  
//	    int bottomHeight = bottombitmap.getHeight();  
//	    //以top wid 为主
//	    Bitmap newmap = Bitmap.createBitmap(topWidth, topHeight+bottomHeight, Config.ARGB_8888);  
//	    Canvas canvas = new Canvas(newmap);  
//	    
//	    /**
//	     * 生成上面图片的rectF 	
//	     * 是图片在Canvas画布中显示的区域 
//	     */
//	    RectF topSrcRect = new RectF(0, 0, topWidth, topHeight);  
//	    /**
//	     * 参数二:
//	     * Rect src： 是对图片进行裁截，若是null则显示整个图片 	     	 
//	     * 参数三
//	     * RectF dst：是图片在Canvas画布中显示的区域 
//	     * 参数四
//	     * 画笔 paint
//	     */
//	    canvas.drawBitmap(topbitmap,null,topSrcRect,null);
//	    canvas.drawBitmap(bottombitmap,0,topHeight, null);  
//	    canvas.save(Canvas.ALL_SAVE_FLAG);  
//	    canvas.restore();  
//	    return newmap;  
//	}
//	
//	
//	/** 
//	 * 合并两张photo为一张  
//	 * 上下合并
//	 * @param topResourceId 
//	 * @param bottomResourceId 
//	 * @return Bitmap 
//	 */  
//	public static Bitmap combineBitmap(Context context,int topResourceId,int bottomResourceId){
//		InputStream topinputstream = context.getResources().openRawResource(topResourceId);
//		Bitmap topbitmap = BitmapFactory.decodeStream(topinputstream);
//		InputStream bottominputstream = context.getResources().openRawResource(bottomResourceId);
//		Bitmap bottombitmap = BitmapFactory.decodeStream(bottominputstream);
//		return combineBitmap(topbitmap,bottombitmap);
//	}
//	
}